网络图标消失不见

sudo service NetworkManager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service NetworkManager start

共享文件夹每次开机失效

sudo vmhgfs-fuse .host:/ /mnt/hgfs -o allow_other

通过rc-local添加开机自启

# 1. sudo vi /lib/systemd/system/rc-local.service
#    在文件末尾追加 

[Install]
WantedBy=multi-user.target
Alias=rc-local.service

# 2.sudo vi /etc/rc.local

#!/bin/bash
vmhgfs-fuse .host:/ /mnt/hgfs -o allow_other
exit 0

# 3.添加执行权限 
sudo chmod +x /etc/rc.local

取消sudo时输入密码

# /etc/sudoers

#
# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
Defaults        use_pty

# This preserves proxy settings from user environments of root
# equivalent users (group sudo)
#Defaults:%sudo env_keep += "http_proxy https_proxy ftp_proxy all_proxy no_proxy"

# This allows running arbitrary commands, but so does ALL, and it means
# different sudoers have their choice of editor respected.
#Defaults:%sudo env_keep += "EDITOR"

# Completely harmless preservation of a user preference.
#Defaults:%sudo env_keep += "GREP_COLOR"

# While you shouldn't normally run git as root, you need to with etckeeper
#Defaults:%sudo env_keep += "GIT_AUTHOR_* GIT_COMMITTER_*"

# Per-user preferences; root won't have sensible values for them.
#Defaults:%sudo env_keep += "EMAIL DEBEMAIL DEBFULLNAME"

# "sudo scp" or "sudo rsync" should be able to use your SSH agent.
#Defaults:%sudo env_keep += "SSH_AGENT_PID SSH_AUTH_SOCK"

# Ditto for GPG agent
#Defaults:%sudo env_keep += "GPG_AGENT_INFO"

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

# No Password sudo members 【重要修改】
ubuntu  ALL=(ALL:ALL) NOPASSWD: ALL

# See sudoers(5) for more information on "@include" directives:

@includedir /etc/sudoers.d